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Ask QuestionPosted by Khushi Chaurasia 5 years, 9 months ago
- 1 answers
Gaurav Seth 5 years, 9 months ago
a = 121
d = -4
let an= 0
then
an = a + (n-1)d
=> 0 = 121 + (n-1)(-4)
=> 0 = 121 - 4n + 4
=> 4n = 125
=> n = 125/4
=> n = 31.25
as n must be natural number then n= 32
32nd term is First negative number.
a32 = 121 + (31)-4
= 121 - 124 = -3
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Posted by Siddharth Kumar 5 years, 9 months ago
- 1 answers
Gaurav Seth 5 years, 9 months ago
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Posted by Pankaj Malik 5 years, 9 months ago
- 1 answers
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| Atomic No. | Valency | |
| Valency of Calcium | 20 | 2 |
| Valency of Scandium | 21 | 3 |
| Valency of Titanium | 22 | 4 |
| Valency of Vanadium | 23 | 5,4 |
| Valency of Chromium | 24 | 2 |
| Valency of Manganese | 25 | 7, 4, 2 |
| Valency of Iron (Fe) | 26 | 2, 3 |
| Valency of Nickel | 27 | 3, 2 |
| Valency of Cobalt | 28 | 2 |
| Valency of Copper (Cu) | 29 | 2, 1 |
| Valency of Zinc | 30 | 2 |
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